I don't really buy kits that often tbh, the only recent one I bought was the Luke home shirt. I think it would need to be someone 'cool' like that designing our shirt again next year for me to buy it.
Kappa definitely have the potential to make cool kits but they've not really hit the mark with any of them for us imo.
Of the big boys, I think the only way I'd buy it is if Nike did us an Air Jordan deal like PSG which will never happen in a million years or if Adidas did us an Originals shirt, complete with the trefoil logo.
That option is only kept alive in my imagination due to big Nas and his stake in Adidas. If that happened they could name their price though.